Selecting a BLDC Motor for an Electric Tricycle | 400W, 48V, 0-4m/s in 20s

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The discussion focuses on selecting a BLDC motor for an electric tricycle with specific constraints of 400W power and 48V voltage. The tricycle, weighing approximately 400 kg, aims to achieve a speed of 0 to 4 m/s within 20 seconds. Key calculations involve determining the change in energy for the mass during acceleration and assessing whether the motor can provide sufficient power for both speed and hill climbing on a 7-degree gradient. The potential energy increase during ascent is calculated using the formula (m g delta h)/(delta t), which helps evaluate the motor's climbing capability. Ultimately, the discussion emphasizes the importance of ensuring the motor can meet the required performance metrics within the specified time frame.
Shravan N Agni
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We are designing an electric tricycle having rear wheel drive(26 inches wheel dia).It will weigh around 400kgs including drivers.

There are constraints for motor output power(max 400 watts) and voltage(max 48v).
What are the calculations to be done for the selection of motor.
The desired speed of the vehicle is 0 to 4m/s in 20 seconds.

How can I calculate the speed of the vehicle for hill climbing(max 7degree gradient)?

Thanks in advance
 
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Calculate the change in energy for the given mass going from Vi to Vf in the time allowed.

Can the motor do this much work in this period of time? Does it deliver sufficient power?

On a given gradient at a given speed, the vehicle will be increasing in potential energy at a rate of (m g delta h)/(delta t).

Use this to figure out its max rate of climb with a motor delivering a given power.
 
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